Stop mechanism for knitting-machines



A. WACHSMAN.

STOP MECHANISM FOR KNITTING MACHINES.

APPLICATION FILED AUG-9, 1918.

1 58,483, Patented Nov. 9, 1920.

a! SI nvewfoz UNITED STATES PATENT OFFICE.

ADOLPH WACHSMAN, 0F AVERNE, NEW YORK.

STOP MECHANISM FOR KNITTIN G-MACHIN ES.

Application filed August 9,

To all whom it may concern.

Be it known that I, Anonrn \VAoHsMAN, a citizen of the United States, residing at Averne, Long Island, and State of New York, have invented a certain new and useful Stop Mechanism for Knitting-Machines, of which the following is a specification.

This invention is a stop mechanism particularly adapted for use on machines for knitting sweaters, hosiery, and similar articles.

Speaking generally, the invention, from a functional standpoint, is an improvement in devices 'of the character specified, which operate to release a catch or equivalent element, which, in turn, causes a member associated with the knitting machine to be thrown into operation for the purpose of stopping the machine, whenever a knot or other similar defect in the yarn or thread coming from the bobbin stand occasions the thread, through suitable mechanlsm, to exert undue tension or pull, thereby actuating the stop device.

Aside from the general structure of the device, the invention, from a more specific standpoint, embodies improvements in the spring connection for closlng the clrcuit through the device, in the means for regulating the tension on the actuating levers of the device, and in the efiicient, short leverage whereby the lever and spring are brought into positive engagement without producing undue pressure on the spring.

Features of the invention, other than those specified, will be apparent from the hereinafter detailed description taken in conjunction with the accompanying drawings.

In the accompanying drawings, I have .illustrated one practical form of the invention, but the construction shown therein is to be understood as illustrative, only, and not as defining the limits of the invention.

Figure 1 is a side elevation of the stop mechanism;

Fig. 2 is a View, partly in section and partly in elevation, on line 2-2 of Fig. 1, looking in the direction of the arrows;

and

Specification of Letters Patent.

I provided with a slot 10,

Patented Nov. 9, 1920. 1918. Serial No. 249,043.

ing inwardly from the side plate 6, form the support or housing for the other elements of the device, together by means of a screw 7'. mounted between plates 5 8, is a lever 9, the outer Pivotally and 6, on screw end of which is see Fig. 1. Top plate 7 is provided with a hooked extension 11, the nose 12 of which normally extends downwardly, into and through slot 10, thereby providing an inclosurejlS through which a thread 14 is passed for the purpose hereinafter described.

Lever 9 is maintainedin its normal position, under tension, by means of a coiled spring 15, the upper end of the spring being connected to the inner, pivoted end of lever 9, thereby tending to force the outer end of said lever upwardly, so that slot 10 in the lever embraces the nose 12 of extension. 11. The lower end of spring 15 is secured to one end of a lever 16, the center of which lever is twisted upon itself to form an eye 17 whereby the lever is loosely mounted on a stud 18 projecting from the inner face of plate 6, see Fig. 3. Lever 16, through the medium of a finger piece or loop 19, may be locked in any one of the series of depressions 20, extending inwardly from plate 6, thereby providing a means for regulating the tension on coil spring 15.

Mounted on the under face of plate 7 is a flat or leaf spring 21, through the medium of a screw 22, and nut 23, the spring being kept out of electrical engagement with the plate 7 by means of suitable insulating gasket 24. The free end of spring 21 is normally out of contact with lever 9, as shown in full lines in Fig. 3, but is brought into mechanical engagement with the inner end of the lever when the lever is caused to assume the dotted position shown in Fig. 3.

Screw 22 serves as an electrical connection between the spring 21, and one lead 25 of a battery, or other source of electrical energy, 26, the other lead 27 of the battery forming a circuit, hereinafter described, with an electromagnet 28. The pole 25 is insulated from plate 7 by the insulating gasket 29.

3O designates the main shaft of a bobbin stand, to the upper end of which is secured an annulus 31 on the periphery of which are secured a plurality of the locking devices of this invention, one for each knitting machine, through the medium of a perforated these plates being held lug 32, aliixedto the device and a screw 33,

V stopping the machine.

Associated with'the bobbin machine is a series of perforated plates, or equivalent devices, one for each knitting machine, through which the thread 14 passes on its way from the bobbin to the stop device, thenceto the knitting machine. One of these plates is diagrammatically shown at It is provided with an eye 36, through which the thread is fed in the direction indicated by the arrow, whence it passes through the inclosure 13, being passed over lever 9, and thereafter to the knitting machine. v

The eye 36 is ofsuch size that if the thread being fed therethrough contains a knot, or other enlargement, thelatterivill not pass through the eye. Thisresults in tension being placed upon the thread, with the result that lever 9 is pulled downwardly to thedotted position shown in Fig. 3, whereupon through the electrical connection heretofore described, the trip 3-l'is actuated and releases a lever or other member controlling the power to the knitting machine.

The electrical circuit,by which trip 34 is operated, will be readily understood from the foregoing description, but it may be briefly described as follows: When the lever 9 isdepressed, its pivoted end mechanically engages spring 21, thereby establishing the circuit'which passes through lead 25, to battery26 and lead 27, whereupon the electromagnet is energized and lifts trip 34. The circuit is grounded from the stop device through the main shaft 30 of the bobbin stand, from which the circuit is completed'to electromagnet 28, through wiring 37.

It Will be understood that slight changes may be made in the structure described,

such as the substitution of equivalents, Without departing from the spirit or substance of the invention, the scope of which is commensurate with the appended claims.

Having described the invention what I claim is:

l. In a stop mechanism for knitting m'achines, a suitable support, a lever pivoted thereto provided with a slot, at hooked member having its nose or end normally extending through the slot, at source of electrical energy, an clectromagnet, a trip actuatable thereby, and a leaf spring in circuit with the source of electrical energy and magnet and cooperating with the pivoted lever so that the latter may make and break the circuit depending on the position of the hooked member with reference to the slot in said lever, whereby, when the lever is in engagement with the spring, the electromagnet is energized. and the trip actuated, and when the lever is disengaged from the spring the circuit is broken.

2. In a stop mechanism for knitting'machines, a suitable support, a lever pivoted thereto, a source of electrical energy, an electromagnet, a trip actuatable thereby and a leaf spring in circuit with the source of electric energy and magnet and coiiperatin with the pivoted lever, a spring having one end afiixed to said pivoted lever and the other end secured to 'a. second lever and means for adjusting the latter to vary the a tension on the spring and the pivoted lever.

3. In a stop mechanism for knitting machines, a suitable support, a lever pivoted thereto, a hooked member extending from the support and cooperating with the lever so as to normally form an inclosed space for the passage of-the thread to a knitting machine, a source of electrical energy, an electromagnet, a trip actuatable thereby and a leaf spring in circuit with the source of electric energy and magnet and cooperating with the pivoted lever, a coiled spring for exerting tension on the lever, and a manually operated lever forregulating the tension on the spring.

In testimony whereof, I have signed my name to this specification.

ADOLPH VVAOHSMAN. 

